how many mutiple nic's can be created for a same instance in same network

asked 2015-04-15 05:34:47 -0600

chandrasekar gravatar image

Hi

Pls advice me how many mutiple nic's can be created for a same instance in same network.

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answered 2015-04-15 09:33:28 -0600

sgordon gravatar image

updated 2015-04-15 09:34:06 -0600

The limit on the number of NICs that can be attached to an instance, at least when using the Libvirt/KVM driver, is tied to the number of devices that the VM can have on a single PCI bus (32). Several of these slots are taken by system devices by default leaving you with 28 slots for NIC attachment [1].

Whether those NICs are on the same network or not is not a factor, if the environment is configured to allow multiple NICs on the same subnet (supported as of Juno) there is no explicit limit on how many there can be - the limit is the aforementioned PCI bus limitation.

[1] https://access.redhat.com/documentati...

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Asked: 2015-04-15 05:34:47 -0600

Seen: 1,582 times

Last updated: Apr 15 '15